A dual-beam Nasmyth spectrograph

Details A dual-beam Nasmyth spectrograph A dual-beam Nasmyth spectrograph

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100..626r&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, May 1988, p. 626-634.

Physics

Optics

55

Astronomical Spectroscopy, Spectrographs, Charge Coupled Devices, Photoelectrons, Spectral Resolution, Telescopes

Scientific paper

A recently-constructed double-beam spectrograph mounted on the Nasmyth focus of the Australian National University 2.3-m reflector is described. The spectrograph features two 150-mm collimator beams, with high-throughput optics in each arm. Spectral resolutions range from 40 to 240 km/s. Flexure in rotation about the Nasmyth axis is elastic and has an amplitude of + or - 16 microns in the camera focal planes. With S-20 and NEA Ga-As cathodes in large-format photon-counting arrays, the system detects 1 photoelectron/A sec from stars with B = 15.0 at 4000 A and R = 15.1 at H-alpha. Some precepts from the optical configuration of this spectrograph may be applicable to the design of Nasmyth spectrographs for the large altitude-azimuth telescopes to come.

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